Transcript for Scramble for US Speed Skaters at Olympics to Get a Winning Suit

Next here tonight, a last-minute scramble under way, right now, at the olympics. America speedskaters are shedding their suits, some of them blaming a new outfit for costing them the winning edge and ABC's Matt Gutman is on the ground for us again tonight. Reporter: It is the fastest sport on two feet --sprints raced on scalpels edges, raced on scalpels edges, determined by razor-thin margins. In the men's 1000 meter race, the difference between gold and silver, just four hundredths of a second. American Shani Davis, the world's record holder, was expected to win. Instead, he came in eighth. In fact, after six races, not a single American speedskater has medaled. Tonight many American skaters are blaming not the power in their legs, but those new suits on their skin, engineered by under Armour and lockheed martin, tested in wind tunnels for hundreds of hours, promoted as revolutionary. We have just built the fastest suits ever. Reporter: This vent in the back with these holes to keep the athletes cool. But watch Davis here. As he skates, air is flowing over his body, the suit's job is to minimize how much that air slows him down. The concern now is that air is seeping into those vents, possibly causing a tiny balloon on the suit and creating an extra drag on the skater. At least one American speedskater even resorted to covering that back vent with rubber. American skater Brian Hansen saying "Literally everyone is under performing, you can only look at so many factors, the suit is the easiest to fix." Reporter: Tonight, word from the international olympic committee, they can switch to these suits, worn at the world cup in December. Also designed by under Armour, but without those back vents. Team usa hoping it will pave a path to gold. Tonight under Armour stands by its suit, calling it the most "Scientifically advanced and rigorously tested ever." They have six events left. Diane sf. Some pretty clever packing to bring the old suits.

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